Spring hammer



R. C. BOWEN SPRING HAMMER Sept. 9, 1930.

Filed Aug. 27, 1929 Patented Sept. 9, 1930 ,f eration.

.:Visiorifoffmeans;l in117co'mbinatio'n i therewith,

:hammergorapowerdrillselectivelyl ii'Wit-h the foregoing and yotherzgobsjectsi in .i view, the Anature of ;whic"l1;:Wil1-bec0me appari-z ent,fthe;r invention? .consists-,in the novel `con- 151'-partsghereinafter described and claimedr.,

parts being shown in 2`0 hammer die yor. :tool indicated by dotted lines.

' and 3&3;respectively,y,ofrFig;ll'pFiglA is a horizontalevertical section, n through of ,f

liFigilgand Fig. 5 is-asdetailivievv'lof therotor af'and, hammer membersshown in :Fig: 1,1aand indicatingthe relativepositionsof thereforeysa-id members preparatorytto: the

s the yspriug--impelledhammersf1 f f represents, generally,n al fcasing,i= `desirably ewformedi-to :provide a depending y"tubular pon f tionfftifofset froml trimmer-line: ,set .Yup-,in a spring assertsts contnuatonf'ofthe blow, t

' v-eifectuallyeliminateundue slioclnfand,` allow- .'ing'-, of a -readyyretraction in compressiiigthe successivesprings. Y f

part; andis vadapted" to house 'thereinzainotor .f llgrand suitable Y' hereinafter descri 4o f in the-,floorlliof thefhousing-S, vand by acollar 45,"v

:.1,@I6-voi?saidfhammen actin init e-bore l'fof @such casin portion. y; 5I? av so provide f inthe upper and'r ower extremities, respectively.,` of."`

h1s;inv`ention relates Ito electrically vcon-- ,1 trolled spring;hammersy'and?hasfor Ianob- Tjectntlie provision of :improvements'inham- .mersaof-vtliistypewherebygthe devicegis ren- 5-1fdered more convenientand 4,efficient in'its Ope structiongzarrangement ,f Aand combination of of aforesaidtnbular portion y c eive, surronndingthehammer 142, alpair of i, ction ,i complementary .annularcompression springs is of" an embodiment ,of the present;` invention,

' side elevation-andthe have the v l0,wer flute 28,` t A apart-relation above ythe hammer co11arl5,the-

release-:of y 1 Said casing alsoincludes a portion 9 secured.

earedwdriving mechanism, .ed 4, if: tO SL'OId tWO bifurcations As illustrated, the aforesaid tubeY casing, e' fifportion 7 is arrangedto have disposed, axially. f l therein; a icylindricall strikingv member ory f I f. 'hammer-' 12,5 guided vby] vaI bearings-13 provided;-.

15, screwy threaded upon the: pro 'ectin'gfnipple leeved` Within the lprojecting :end of` said v or Q'SATTLE wnsiriN'roN, 4fissionor; or

cnn-'HALF l'ro emiten applicano' nl'dfkliugu'stfi27,;192av serigim'.- assises ff lcisigptiti 7', mi p'raa with ininllange v18 arranged yfor seating engagenula r mentA lWith said" portion extren1ityis ahead piece `19,'Within YWhichis an adjustablescrew threadedbushin'g nut20 in which ,operlatesthe shank of a suitable "hammerdie or-tcol 21', i;

be insertedbetween said bears, ing 18 and the casing loorfll', isyanannnlar' ,J ,Arranged to Aring,member 22secnred; rin rigid engagement therebetween vthrough ysuitable Harige bolts 23, and 1s desirably provided with@ plurality .offspring en 0a Ging inwardly. projecting rar ,.dalvfinger,elmtimtsQt (Fi 3 Reference :beinghad 'to 7 is adaptedy to "re- Saidymajor spring isl clamped betrveeii lthe aforesaid Vfingers 24 andthe bearing minorsprmg being arrangedinteriorly lthere- @fand'HftsprlllgI pressed i .engagement between the opposing secured hammer .collar said bearing 13.

ereof, in fspaced -g The describedy spring structnre alldws lthe` `hammer and its associated collartohave sucfp,alReference:beingehadi thereto, the numeral;y y d spring providing ,an lellective highly, com- -cessive impulses imparted thereto, the major pressedkicking action, wherelipon the `minor The end of the striking-memberwitliinthe chamberSis slotted longitudinally,' as at 29, 3.0,wl1ich arebored transversely to yreceive afpin 3l, upon which is mounted, LWithin theslot29,a=roller 83.

Guide-rods 231' cooperating withtracks-32 of,-I 'sa'idarms v30, eliminate lateral thrnst tothe aforesaid bifurcated arms. t.

i 35 represents@ Shefft Whichextndstlgh 2'] ournal bearings '3.4, provided: in .the end Walls of thecasing, andis driven` throughv suitable rmeans,represented as a gear Wheel lmveshing with afpinionv 37, having its shaftcarried Vin the head piece 38 Aof*saidcasing 8*,andactuated by a suitable reduction gear 39 meshing with the driven pinion 40 o the motor.

As shown, said motor is suspended in suitable standards of the casing portion and is controlled through a linger lswitch 41 vof a handle 42, integral with said portion l0.

l 4Revertiiig to the aforesaid shaft, l provide a centrally located integral rotor '43, having substantially intermediate of its 0 width, a diametrically disposed slot 44, within which, for limited longitudinal movement, is a gravitationally propelled slide bar 45. Said slide, furthermore, in restricting such 'movement', is engageable, in aslot 46 there- 'of, with a set screwl 47 of the rotor, and.'as such, provides a medium whereby said slide y"is actuated in reciprocatory movement, rel sultant of the rotative movement of said rotor yto position said slide intovlifting engagezo'ment with the roller 33l of said bifurcated hammer portion.

Itf'will be readily understood from the foregoing, that the hammer is afforded a succession of two blows per rotor revolution.A -Thel "effective"` impulse `of the hammer against thevr die is adjustably regulated through the medium of the heretofore described bushingnut 20, the faced position thereof being preferably knurled to facilitate o'ready 'selective rotative adjustment bylan operator.` v l .y In combination with the foregoing hammer structure, I shaft 35,y an interiorly screw threaded'eX- as p'osed hub portion 48 (not shown) where is'` enlarged to encase drilling operations.

The operation of the striking memberis o as follows: -1

Closing switch 41-aifords`a current of electrical energy toi actuate the motor, rotatingv the gear wheel 86 and the pinion 40 to drive rotor 43 carried thereby.` f 4 f 45'y The rotor thus driven -gravitationally jdrops slide 45 through its slot 44 and vacts f to impart, through revolutionl thereof, eleva- V tional movement to the roller 33, whereby helical springs 26, 27 are successively coin- 5o pressed.

"As the slide progressesin its revoluble movement, theroller 33 spins on its axis 31 andrimparts a force-` cooperative with the gravitational pull' to retract in disengagement therefrom the aforesaid slide 45 to the posi-"f have provided, axially y'of 'the (Fig. 4) arranged to take theprojectin threads'o'f a drilltoolv by the utility of the device slidably engaging therein, nicati'ng with said cylinder,

upper portion off saidfmem through said bearing, a rotor, cooperating with.

is applied to the hammer member, lateral thrust being obviated through the roller arrangement and guide rods.

The construction, arrangement and operation of parts is believed clear from `the foregoing, it 'being obvious that numerous changes might be resorted towithin the scope of the appended claims.

What'l claim, is

In apparatus of the class described comprising a cylinder having a vertically adjustable bushing vsecured in its outer end, a tool slidably engaging therein, a housing communicating with said cylinder and havl ing a'bearing secured tothe floor portion thereof, a' reciprocating striking member in the cylinder having a Vslotted'upper end eX- tending through said bearing intothe housing, complementary springs in said cylinder for driving the striking member against the tool, one of said springs being secured in depending relationship from lsaid bearing, the

lother of said springs being arrangedin opposing.y

relationship between saidbearing and a collar securedto'said member, a driven rotor and ay slide for said rotor arranged'for longitudinal gravitational movement -in `a slot thereof and adapted to rotate throughr the slotted end of the member to continuously impart intermittent retractive movement to `said striking member inopposition to said said slide for restricting thelon itudinal gravitational vmovement of said sli e.

In apparatus of theclass described comapparatus' y*as defined in claim 1,- f wherein means are providedin said rotor and prising acylinder having a vertically adjusti able bushing secured in l'its outer end, a tool a housing commua reciprocating striking member insfthe cylinder having a slotted upper end extending into said housing, a rotor, `a slide for said rotor arranged for limited gravitational movement in a slot thereof landadapted to lrotatevthroughthe slotted end of the member to impart intermittent retractive movement thereto, a vmo-vv .tor for continuously drivingsaid rotor, and

f spring means acting in opposition to said rotor retracti've action and adapted to impart striking movement to said member against' ysaidtool. r u l 4.' A hammer ofthe 'class described coinprising a strikingmeinber', a cylinder for said member, a collar secured to the lower portion of said member andarranged for. verticalmovement in said cylinder, a bearing, the er .extending ay gravitationally propelled slide in said rotor, a roller carried by saidstriking member and engageable ,by said slide to retract saidstriking member, and means acting in opposition thereto to effect intermittent striking motion to said member in the opposite direction to for imparting axialmotion to said member in the opposite direction.

6. In apparatus as defined in claim 5, a shaft for said rotorjournaled in end Walls of the casing and'having an'exposed portion at one end thereof, said exposed portion being adapted to engagethe shank of a drill in a manner to impart rotative movement thereto.

Signed at Seattle, Washington, this 3rd day of August, 1929.

i RUSSELL' C, BOWEN. 

